A computational approach to determining the depth of surface flaws by the ACPD technique

Autor:	S. G. Sampath, Okada Hiroshi, Zhao Wei, Satya N. Atluri
Rok vydání:	1992
Předmět:	Laplace transform Mechanical Engineering Geometry Inverse problem symbols.namesake Maxwell's equations Mechanics of Materials Empirical formula symbols General Materials Science Electric potential Laplace operator Boundary element method Voltage drop Mathematics
Zdroj:	Engineering Fracture Mechanics. 43:911-921
ISSN:	0013-7944
DOI:	10.1016/0013-7944(92)90021-6
Popis:	The boundary element method is used to analyze the ACPD (alternating current potential drop) field perturbed by a semi-elliptical surface flaw in a metallic sheet. The depth of the penetration of the alternating current is assumed to be small as compared to the crack depth. This allows us to adopt the “unfolding” technique developed by Dover et al. [ ASTM STP 722 , 401–427 (1981)], which reduces the problem to a two-dimensional surface Laplacian field. This surface potential field is determined for different surface cracks with crack aspect ratios ranging from 0.2 to 2. To facilitate the use of these results, an empirical formula is developed based on the numerical results. A simple inverse analysis methodology is also developed for determining the crack depth for semi-elliptical surface flaws of known surface length with measured potential drop readings.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9cf1ad4fff37d3a628dc2c6e922b2910 https://doi.org/10.1016/0013-7944(92)90021-6 Zobrazit plný text záznamu